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(No Model.)

W. BERWIOK & G. SELLERS. COMPOUND ENGINE.

No. 390,434. Patented 001;. 2, 1-888.

WIT E5555.

: QD W M. I f z fiez w u PETERS. FhoIn-Lilhcgrapher. Washington, 0.4;

Uwrrnn Starts a'rnn'r rrrcno WILLIAM BERNVIOK, OF FALL RIVER, MASSACHUSETTS, AND GEORGE SELLERS, OF BATLEY, COUNTY OF YORK, ENGLAND.

COMPOUND ENGINE.

SPECIFICATION forming part of Letters Patent No. 390,4:34, dated October 2, 1888.

Application filed December 39, 1896. Serial No 222,861. (No model.) Patented in England October 14, 1885. No. 12,262.

To a'ZZ whom it may concern.-

Be it known that we, WILLIAM Bnawron, of Fall River, in the county of Bristol and State of Massachusetts, in the United States of America, and Gnonen SELLERS, of Batley, in the county of York, England, a subject of Victoria, Queen otGreat Britain and Ireland, have invented a new and useful Improvement in Compound Engines, (which was patented in Great Britain October 14, 1885. No. 12,262,) of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming a part of this specification, in explaining its nature.

The invention relates to a compound engine having two or more cylinders, one at least of which is longer than the other or others, and to the connections between the pistoirrods of the said cylinders and a fly-wheel, crank, or other rotating part of the engine, whereby there is caused to be exerted thereon a continuous rotating force or effect.

It also relates to the use, in a compound engine, of two or more cylinders, one of which is longer than the other, and two pistons traveling therein, one of which has a longer stroke than the others, and which is connected with the flywheel, crank, or other moving part of the engine by a lever and connecting-rod, the lever being so pivoted as to increase the power communicated to its end by the piston.

The accompanying drawing is a view in elevation representing a compound engine of two cylinders, having a portion of the cylinders broken out to show the pistons.

A is the longer cylinder. A is the shorter.

The longer cylinder preferably is arranged over the other, and is adapted to receivesteam under high pressure through the ports a a at the ends of the cylinder. 1) is the piston therein; b, the piston-rod, the outer end of which is connected with a cross-head or slideblock, I), supported by or movable upon suit able ways or slides, This slide-block or cross-head is connected with the lever O by means of the link 0. The lever is journaled upon or supported by the pivot or short bear ing-rod c, and its lower end is connected by means of the pitman or connecting-rod c with the crank-pin d of the fly-wheel D. The sec 0nd or shorter cylinder, A, has the piston 0 attached to its pistonrod c, and the cylinder is adapted to receive the exhaust-steam from the long high -pressure cylinder A, and of course acting expansively in the shorter cylinder. This cylinder is considerably larger in diameter than the longer cylinder, and preferably is arranged immediately below it. The piston-rod of this cylinder is connected directly with the crank-pin d of the fly-wheel through the slideblock or cross-head 6 which is mounted upon the ways or slides e and the pitman or connectingrod e.

The two cylinders are connected by suitable ports controlled by valves, and the high-pressure cylinder exhausts, preferabl y,directl y into the low-pressure cylinder, although this is not essential. The low-pressure cylinder has suitable exhaust ports and valves for controlling them. The highpressure cylinder is made longer than the lo w-pressure cylinder,in order that its piston may have a sufficiently long stroke to communicate through a lever additional or multiplied power to the crank-pin (Z,- and it will be seen that the lever represented in the drawing is so pivoted as to substan tially double the amountof power of the long cylinder-piston upon the crank-pin. Of course this lever, when connected with a crank-pin common to the pitman or connecting-rod of the direct acting piston,-must be so pivoted and of such proportion as to communicate to its connectingrod or pitman the same range of movement as is given the other connectingrod or pitman. It will be seen that by this construction the actuating force is applied to the crank-pin of the fly-wheel from two directions, so that there can be substantially no dead-center so far as the two pistons and connectingrods are concerned, as when the crankpin is on a dead-center with one slide-block or cross-head it is not upon a dead-center with the other, and the other continues to exert force upon the crank-pin until it has passed by the dead-center of the other crosshead, when the other piston operates to throw the crank -pin by the dead center of the first named.

We would not be understood as confining ourselves to the especial form of construction shown in the drawing, as there are many different forms and arrangements of devices a cheese which may be substituted or used for those herein named without, however, varying from the essential features of the invention. For instance, it is not necessary that the long cylinder be placed above the short one. It is not essential that the long cylinder exhaust directly into the lowpressure cylinder. The length of the stroke of the piston of the long cylinder may be increased or diminished from that shown, and the lever may be increased or decreased in length. The connections between the end of the piston-operated lever and between the cross-head or slide-block of the other or direct-acting piston may extend directly to a common crank-pin, or to separate crank-pins, or to any other rotary part of the engine or part to which it is desired to coinmunicate mot-ion.

It will be seen that the pistons of the two cylinders will travel in reverse directions.

The advantages of this invention are obvious. In lieu of the lever, of course any other mechanical equivalent for multiplying the power of the piston of the long cylinder during its transmission to a crank or other part of an engine may be employed.

Ve are aware of the compound engine shown and described in British Patent No. (354 of1872, in which there are high and low pressure cylinders, the cross head of the piston-rod of the low pressure cylinder being connected to the crank by a pitman and the cross-head of the piston-rod of the high-pressure cylinder being connected with the former cross-head through suitable levers and links; and we do not wish to be understood as claiming, broadly, a compound engine having high and low pressure cylinders with a direct pitman-connection between the piston-rod cross-head and the crank and an indirect or lever connection between the cross head of the high pressure-cylinder pistonrod and the low-pressure-piston crosshead, such as is shown by the said patent.

One very essential point of difference between our engine and the engine shown by the patent just referred to lies in the fact that in our engine there is practically no dead-center, the arm of the lever C, which is connected by center with relation to the pitman e and crosshead c it will be off the dead-center with relation to the pitman c" and the connection of the said pitman c with the said lever, and vice versa, as will be clear from the drawing.

Having thus fully described our invention, we claim and desire to secure by Letters Pat ent of the United States 1. In a compound engine, the combination, with the crank-shaft and crank, of the highpressure cylinder A, the low-pressure cylinder A, pistons and piston-rods for said cylinders, slides or cross-heads for said piston-rods, a pitman connecting the low-pressure pistonrod cross-head to the said crank, a lever having long and short arms, as described, a pitman connecting the long arm of the said lever to the highpressure piston-rod cross-head,and a pitnian connecting the short arm of the said lever to the said crank, substantially as set forth.

2. In a compound engine, the combination, with the crank-shaft and crank, of the highprcssure cylinder A, the low-pressure cylinder A, the high-pressure cylinder being of greater length than the low-pressure cylinder and the latter being of greater diameter than the high-pressure cylinder, the pistons b and e, the piston-rods b and a, the slides or crossheads I) and 6 the lever G,pivoted off its center and thus having long and short arms, as described, the pitman 0, connecting the long arm of the said lever with the said cross-head b", and the pitmen e and 0 connecting the said cross-head e and the short arm of the said lever, respectively, to the said crank, substantially as set forth.

WVILLIAM BERW'IOK. GEORGE SELLERS.

WVitnesses to the signature of the said William Berwick:

R. HAMrsoN, S. STANSFIELD.

\Vitnesses to the signature of thesaid George Sellers:

BENJAMIN HAMPsHIRE, WM. GOODALL CHAMBERS. 

